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The Department of Justice confirmed to WISN 12 News that its crime lab is assisting in the investigation.

Joyce Dibb has lived in the Hartland neighborhood for more than 30 years. She said she's never seen anything like the crime scene across the street.

"The sirens weren't going off or anything, but it was just kind of surprising,” Dibb said. “It was engulfed in tape there was different area policemen here.”

Hartland police said they were called to the home on Merton Avenue for a noise complaint. When they arrived investigators said they heard loud music coming from a car in the driveway and found the man dead inside.

Police said the man died of a gunshot to the chest. Officials have not identified victim.

More than eight hours later, crime scene technicians were still on the scene. They had constructed a tent over the car in the driveway.

"We were wondering what was going on, and it was just like, we still don't know what's going on," said neighbor Ana Fuente.

Police declined to say how the Pewaukee man came to be in this Hartland driveway or answer any questions about their investigation.

No one at the home would comment Sunday. Police said they do not have anyone in custody and do not believe there is a threat to the public.